17．An increasing number of people are taking up cycling in their spare time，as it is quite beneficial to health and the environment．

分析 許多人在他們的空余時間里從事騎自行車活動，因為這對健康和環(huán)境是十分有益的．

解答 答案：beneficial 考查首字母填空．根據(jù)句意及句子結構，要填入形容詞，beneficial意為"有益的"，是形容詞作表語．

點評 考查首字母填空．準確地翻譯句子、理解句子，然后根據(jù)句意及提示完成句子，使句意更通順．

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